CDC Laboratory Techniques & Technology 4

Question 1

Which of the following best describes the role of alumina sandblasting prior to porcelain application on a metal-ceramic framework?

Accepted Answer

Creates micro-mechanical retention and removes surface contaminants

Answer

Alumina sandblasting roughens the metal surface for mechanical interlocking and removes oils or oxides that would inhibit ceramic adhesion.

Question 2

When fabricating an implant-supported ceramic crown, the internal conical connection angle of the abutment primarily affects:

Accepted Answer

Screw-joint stability and resistance to micro-movement

Answer

The taper angle of conical connections (e.g., Morse taper) creates a cold-weld frictional lock that resists micro-movement and reduces screw loosening.

Question 3

A dental ceramist is asked to increase the value (brightness) of a restoration without changing its hue. Which action achieves this?

Accepted Answer

Selecting a higher-value (lighter) body ceramic and reducing stain pigment

Answer

Value is controlled by the lightness of the ceramic; using a higher-value body porcelain with minimal dark stain increases brightness independent of hue.

Question 4

In the context of removable partial denture frameworks, what is the purpose of stress-relief loops in clasps?

Accepted Answer

Distribute flexural fatigue and prevent clasp fracture

Answer

Stress-relief loops (U-loops or coils) lengthen the effective clasp arm, distributing flexural stress over a greater area and reducing fracture risk.

Question 5

What is the MAIN advantage of using a full-contour wax-up before designing a ceramic restoration digitally?

Accepted Answer

It provides a functional and esthetic blueprint that can be scanned as a reference

Answer

A wax-up establishes ideal occlusion and esthetics that can be scanned into CAD software as a digital design reference, guiding the final restoration contour.

(CDC) Certified Dental Ceramist Practice Test

(CDC) Certified Dental Ceramist Practice Test

CDC Laboratory Techniques & Technology 4